JP2000334363A - Renewing apparatus and renewing method for junction or branch pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a renewing apparatus for a junction pipe or a branch pipe whose tempo ral installation is simple and easy to be handled and which does not cause stagnation of pig and provide a renewing method for a junction pipe or a branch pipe by which operation and adjustment at the time of polishing and coating process are made easy to carry out even by an unskilled worker and a work can be carried out on the junction pipe or the branch pipe without requiring dividing the pipes by the diameter and without requiring shift of the temporal installation in the midst of the work. SOLUTION: An opened end of a main pipe 11 of a junction or branch pipe 1, which is an object to be renewed, to a suction apparatus 4 through a pig/coating material receiving apparatus 2 and meanwhile, open ends of respective branch pipes 12, 13, 14 are connected to a suction pipe 6 having an opening and closing valve 7 through a pig/coating material insertion part 5. Using a pipe renewing apparatus connected with such pipes, pig or pig together with a coating material is inserted into the pig/coating material insertion part 5 of an optional branch pipe: the suction apparatus 4 is started to keep the inside of the pipeline 1 at negative pressure: the opening/closing valve 7 of the suction pipe 6 formed in the pig/ coating material insertion part 5 is operated to introduce outer air while controlling the intake amount: the pig is moved by the pressure difference generated in front and in rear sides of the pig to polish or coat the inner surface of pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for rehabilitating a junction pipe or a branch pipe.

[0002]

2. Description of the Related Art Water pipes and drain pipes laid in buildings, condominiums, various plants and the like, when used for a long time, cause rust and corrosion on the inner surface of the pipes, deteriorating their functions, and finally becoming unusable. It is only necessary to replace the pipe with a new one before a malfunction occurs. However, replacement of the pipe involves inconvenience such as long-term water cutoff and requires a great deal of cost. Therefore, a method has been adopted in which, without moving the existing pipe, rust and deposits inside the pipe are removed as they are, the inner surface of the pipe is polished, and a rustproof coating is formed on the inner surface of the pipe to rehabilitate.

Various methods have been used for the rehabilitation of these pipes. In recent years, pressure-feeding extrusion methods using compressed air have been actively studied. In other words, in the polishing step, which is the first step of pipe rehabilitation, compressed air is introduced from one end of the pipe, and an abrasive is injected into the high-speed air stream and pressure-fed, or a polishing pig is pressure-fed to cause rust or rust. Remove the kimono,
In the painting process, which is the second process of pipe rehabilitation, in the same way, by using compressed air, the paint itself is pumped, or by placing an application pig on the downstream side of the paint and pumping it,
This is a method of painting the inner wall of the pipe.

[0004] In this press-feed extrusion method, since compressed air is used, the provisional equipment to be prepared is pressure-resistant and the cost is high.
While care must be taken in handling, there is a problem that the pipe to be rehabilitated may be damaged due to the higher pressure applied than in a normal use state, which may cause damage to the weakened part due to corrosion. In addition, when the pig is pressure-fed by the pressure feed extrusion method, rust and adhered substances that have been polished and peeled off in the polishing process accumulate on the front surface of the polishing pig, and eventually the pig is stagnated, and the pig stagnated by applying pressure from the opposite direction. In the painting process, the amount of paint in front of the coating pig decreases as the painting progresses, so the force required for pumping decreases and the pumping pressure needs to be reduced accordingly, The adjustment of the compressed air supply is difficult, and the pigs fly out of the pipe to be rehabilitated instantaneously, making it impossible to perform uniform coating.

[0005] Further, water supply pipes and drain pipes laid in buildings, condominiums, various plants, and the like generally include the following:
A branch pipe is formed so as to divide from a large-diameter main pipe into a small-diameter branch pipe. In the latter case, a small-diameter branch pipe is formed into a large-diameter main pipe to form a merged pipe. In the conventional extrusion extrusion method, the main pipe,
And, preparing pigs of each size according to the diameter of each branch pipe, dividing the piping system by the diameter, performing the pressure feed extrusion operation for each of the divided sections, the number of operations increases,
Work time and labor costs were high. In addition, it is necessary to change the place where the pig is put in according to the divided section, and the pig insertion / launch device and the compressed air supply pipe must be relocated each time. This was another factor that increased working time and labor costs. Fix the pig insertion and firing device to the open end of the main pipe,
Using scalable pigs that have been recently devised, it is also conceivable to perform polishing or painting in a single press-feed extrusion process from the main pipe to the branch pipe without dividing the piping system by diameter,
It is difficult to avoid the problem of unexpected pig stagnation due to poor guidance of the pig at the diverging portion or catching of the pig at a portion where the diameter is reduced from a large diameter to a small diameter.

[0006] In order to overcome the above-mentioned problems of the pig pressure feeding extrusion method, the applicant focused on the pig suction method, and filed Japanese Patent Application No. 10-257.
466, Japanese Patent Application No. 10-375529, etc., has been conducting basic studies mainly for single pipes.

[0007]

The temporary device to be prepared does not require a large scale, is easy to assemble and handle, has little burden on the pipe to be rehabilitated, and the pig does not stay in the middle of the pipe. The operation and adjustment when transferring is easy even for unskilled persons, furthermore, there is no need to divide the piping system by diameter and operate for each division, and pass the merging or branch piping from the branch pipe to the main pipe. Provided is a rehabilitation device and a rehabilitation method for merging pipes and branch pipes that can perform operations and do not require relocation of large temporary facilities such as a pig insertion / launching apparatus and a compressed air supply pipe during operation.

[0008]

According to the present invention, an open end of a main pipe of a merging pipe or branch pipe to be rehabilitated is connected to a suction device via a pig / paint receiving device, while the merging pipe or branch pipe is connected. This is a pipe rehabilitation device in which a pig / paint insertion part is connected to the open end of each branch pipe of the pipe, and a suction pipe having an open / close valve is provided at the other end of each pig / paint insertion part.

Further, according to the present invention, using the pipe rehabilitation device, a polishing pig is inserted from a pig / paint insertion portion of an arbitrary branch pipe, and a suction device is activated to apply a negative pressure to the pipe to be rehabilitated. After that, the outside air is introduced while operating the on-off valve of the suction pipe provided at the pig / paint insertion portion to adjust the intake amount, and the pig is subjected to rehabilitation by a differential pressure generated before and after the polishing pig. It is a method of moving the inside of the pipe to polish the inner surface of the pipe, and further, using a rehabilitation device for the pipe, insert paint and a coating pig into a pig / paint insert portion of an arbitrary branch pipe, and start a suction device. After applying negative pressure to the pipe to be rehabilitated, the outside air is introduced while adjusting the intake amount by operating the on-off valve of the suction pipe provided in the pig / paint insertion section, and occurs before and after the application pig. Move the pig inside the pipe to be rehabilitated by differential pressure and paint the inside of the pipe. It is a method. Both are inventions of a method using the pipe rehabilitation apparatus of the invention of claim 1.

That is, when the object to be rehabilitated is a merging pipe, the open end of the outlet of the main pipe, which is the most downstream of the piping system, and when the object to be rehabilitated is a branch pipe, the inlet of the main pipe, which is the most upstream of the piping system. Is connected to the suction device via a pig and paint receiving device. As will be described later, the polishing pig or the coating pig inserted from each branch pipe is sucked by the suction device, comes to this open end, is received by the pig / paint receiving device, and is stopped.

On the other hand, when the object to be rehabilitated is a merging pipe, it is at the open end of each branch pipe corresponding to the inlet of the pipe system, and when the object to be rehabilitated is a branch pipe, at the open end of each branch pipe corresponding to the outlet of the pipe system. , And connect the pig / paint inserts respectively. A suction pipe having an open / close valve is provided at the other end of each pig / paint insertion portion (opposite to a pipe to be rehabilitated when a pig or paint is inserted). After inserting a pig or a pig and paint from any pig or paint insertion part, apply negative pressure to the pipe to be rehabilitated by the suction device described above, and take in the amount from the on-off valve of the suction pipe of the pig or paint insertion part. By introducing outside air while adjusting the pressure, an appropriate pressure difference is generated to push the pig toward the suction device, and the pig is moved to the pig / paint receiving device while controlling the speed of the pig.

Since the pig is always sucked and moved from the open end of the branch pipe toward the open end of the main pipe having the suction device, it is guided in a very smooth direction even at the junction. In general, since the diameter gradually increases from the branch pipe to the main pipe through the intermediate portion, there is no place where the diameter is reduced on the way, and from that point, unexpected stagnation of the pig can be avoided.

In the polishing step, which is the first step of pipe rehabilitation, a polishing pig is inserted from a pig / paint insertion portion of an arbitrary branch pipe. Various types of polishing pigs are known,
The pipe that is most suitable for the condition of the inner surface of the pipe to be rehabilitated may be selected. In the case where a pipe system composed of a combination of pipes having different diameters is to be rehabilitated, it is conceivable to employ a polishing pig which can be expanded and contracted.

After the polishing pig is inserted, the suction device is started with the on-off valves of all the suction pipes closed, the pressure in the pipe to be rehabilitated is reduced to a negative pressure, and then the suction pipe of the pig / paint insertion section into which the polishing pig is inserted. The open / close valve is operated to introduce outside air while adjusting the intake amount. The introduced air flows toward the suction device, and establishes a differential pressure before and after the polishing pig to push the same toward the suction device. The polishing pig moves while polishing the inner surface of the pipe to be rehabilitated, and stops at the pig / paint receiving device. After the suction device is stopped and the inside of the rehabilitation target pipe is set to normal pressure, the polishing pig is taken out from the pig / paint receiving device, and one operation is completed.

In the pressure feed extrusion method, the rust and the adhering matter peeled off by polishing are pushed forward by the polishing pig, and as the amount increases, the load of the pig moves, and the resistance enters between the pig and the inner surface of the pipe to reduce the resistance. There was a problem that it was necessary to remove the stagnant pig by applying pressure from the opposite direction, but there was a problem that it was necessary to remove the stagnant pig by applying pressure from the opposite direction. Riding on the suction air flow, it flows before the polishing pig and hardly burdens the movement of the pig,
The power to move the pig is saved, and the accidental stagnation of the pig is avoided.

By performing this operation on all the branch pipes, the joining pipe to be rehabilitated or the entire branch pipe can be polished without dividing the pipe or relocating temporary equipment. In addition, unlike the pressure feed extrusion method, it is a suction method that is performed with the whole under negative pressure,
Temporary facilities such as pig and paint receiving devices do not have to be large-scale with pressure-resistant structure, and their assembly can be done by simple methods such as fitting, so pigs can be inserted and removed only by removing the fitting. And easy to handle.

In the painting step, which is the second step of pipe rehabilitation, a paint and an application pig are inserted from a pig / paint insertion portion of an arbitrary branch pipe. At this time, the paint is positioned in front of the moving direction in which the application pig moves in the rehabilitation target pipe by the suction operation, and the application pig is positioned in the rear. The amount of paint is such that the inner surface of the pipe to be painted is painted and some surplus appears. Various types of coating pigs are known, but a coating that is most suitable for the paint to be used may be selected. In the case where a pipe system composed of a combination of pipes having different diameters is to be rehabilitated, it is conceivable to employ a coating pig which can be expanded and contracted.

After the paint and the coating pig are inserted, the suction device is started while all the opening and closing valves of the suction pipes are closed, and the inside of the pipe to be rehabilitated is made to have a negative pressure. Operate the on-off valve of the suction pipe of the section to introduce outside air while adjusting the intake amount. The introduced air flows toward the suction device, and creates a differential pressure before and after the application pig to push the pig toward the suction device. The application pig moves while painting the inner surface of the pipe to be rehabilitated, and stops at the pig / paint receiving device. Excess paint is received by a pig / paint receiving device so as not to reach the dust collecting device or the suction device. After stopping the suction device and bringing the inside of the rehabilitation target pipe to normal pressure, remove the applied pig and excess paint from the pig / paint receiving device,
One operation is completed.

In the press-feed extrusion method, the paint is pushed forward by the application pig, so that as the coating proceeds, the amount of the paint decreases, and the force required to move the pig decreases. In order to uniformly coat long pipes from upstream to downstream, there was a problem that it was necessary to gradually reduce the pumping pressure to make the moving speed of the coating pig uniform, but since the present invention is a suction method, The paint flows on the suction airflow before the application pig, and even if the amount decreases with the progress of coating, the burden of pig movement hardly changes, so there is no need to adjust the suction pressure It also saves power to move the pig.

By performing this operation on all branch pipes, the joining pipe to be rehabilitated or the entire branch pipe can be painted without dividing the pipe or relocating temporary facilities. In addition, since it is a suction method, insertion and removal of a pig, insertion of paint, and removal of surplus paint are easy as described above. In addition, although the pig moving speed has a large effect on the finish of the paint, the pig moving speed can be reduced only by finely adjusting the opening of the on-off valve of the suction pipe while keeping the operating state of the suction device constant. Since the pigs can be controlled, even an unskilled person can easily move the pig at an optimum speed. As a result, uniform coating can be easily performed.

By adopting the pipe rehabilitation device having the structure of claim 1, (1) The suction method, so that the pig / paint receiving device and the pig / paint insertion part which are temporary facilities to be prepared are of a large pressure-resistant type. (2) Simple assembly and other simple methods are sufficient for assembly and operation and handling are easy. (3) The pressure applied during the work is negative, so the burden on the pipes to be rehabilitated is small. (4) Without splitting the pipe at the junction or branch pipe to be rehabilitated, insert a pig or a pig and paint into an arbitrary branch pipe and operate the on-off valve of the suction pipe of the branch pipe sequentially. The polishing or painting work of the entire piping system can be performed simply by performing it. (5) Pig and paint receiving equipment, dust collection equipment, suction equipment, or large temporary facilities such as piping for suction are subject to rehabilitation. Or open the main pipe in the branch pipe. There is no need to relocate the pig as the work progresses, since it is only necessary to install it at the end. (6) The pig is always drawn from the open end of the branch pipe toward the open end of the main pipe with the suction device, and moves at the junction. Is also guided to change direction very smoothly, (7)
Generally, since the diameter gradually increases from the branch pipe to the main pipe through the intermediate portion, there is no place where the diameter is reduced on the way, and from that point, an unexpected stagnation of the pig can be avoided.

Further, by adopting the method of polishing the inner surface of the pipe and the method of coating the inner surface of the pipe according to the present invention,
(8) In addition to the effects of (1) to (7), (8) The operation to move the pig is easy, so even unskilled people can operate it easily. (9) The moving speed of the pig can be easily controlled, so that uniform coating can be achieved. Easy to do, (10) Peeled rust and extraneous matter flow on the suction airflow before the polishing pig, so it does not burden the movement of the polishing pig, saves the power to move the pig and prevents unexpected movement of the pig. Stagnation is avoided, and (11) the paint also flows on the suction airflow prior to the application pig, so even if the amount changes with the progress of coating, the load on the movement of the pig does not change. There is no need to adjust, and the effect of saving the power to move the pig is obtained.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing the entire rehabilitation device for a merging or branch pipe according to the present invention. The merging or branch pipe 1 to be rehabilitated includes a plurality of branch pipes 12, 13, 14 branched from a main pipe 11 and an intermediate portion 15. In this figure, a case where three branch pipes are sequentially branched is shown. However, in applying the present invention, the number of branch pipes and the manner of branching do not matter. Main pipe 11
The pig / paint receiving device 2 is connected to the open end of the device. An opening valve 41 for releasing the negative pressure is provided near the pig / paint receiving device 2. On the other hand, each branch pipe 12, 1
Pig and paint inserts 5 are provided at the open ends of 3 and 14, respectively.
Is provided, and a suction pipe 6 having an opening / closing valve 7 is provided at the end thereof.

FIG. 2 shows an example of the pig / paint receiving device 2. In the coating process, in order to prevent excess paint from reaching the dust collecting device and the suction device, in this example, a huge portion 21 having a larger diameter than the connecting portion 28 connected to the main pipe 11 of the rehabilitation target pipe is provided. The lid 22 is attached with a hinge 23 and a clasp 24 so that the excess paint that has been received can be easily removed. A receiving tube 25 is provided in the enlarged portion 21 to receive the sucked polishing pig or coating pig. In this example, the shape is covered with the end cover 26 so that even a small pig can be reliably received. However, depending on the size of the pig used, the end may be left open.
It may be squeezed if necessary. The receiving tube 25 is connected to the connecting portion 29.
And a suction device.
In this case, since the end of the receiving tube 25 is covered with the end cover 26, a large number of holes 27 are provided in the receiving tube 25 and the end cover 26 in order to secure an air passage required for suction. Since it is used under a negative pressure, it is not necessary to have a pressure-resistant specification. The connection portions 28 and 29 may be of a fitting type, and the structure of the lid 22 may be simple. It should be noted that what is shown here is merely an embodiment, and any shape may be used as long as it has a function of properly receiving a pig and a paint.

FIGS. 3 and 4 show an example of the pig / paint insert 5. Elbow 5 connected to branch pipe of rehabilitation target pipe
1, a U-shaped pipe 52 and an elbow 53 having an end plate 61 to which a suction pipe 6 having an on-off valve 7 is attached. Since this is also used under negative pressure, the fitting of the elbow or the like is sufficient by the fitting method. In the polishing step, as shown in FIG. 3, the elbow 53 is removed, and the polishing pig 8 is inserted into the U-shaped pipe portion 52. In the painting process, as shown in FIG.
3 is removed, first, the inner surface of the pipe to be coated is coated, and a certain amount of paint 10 is put in the pipe, and then the coating pig 9 is inserted into the flow side. After the insertion, the elbow 53 is fitted and restored. It should be noted that what is shown here is merely an embodiment, and any shape may be used as long as it has a function of appropriately inserting a pig and a paint.

Next, a method of polishing the inner surface of the pipe and a method of coating using the constituent device will be described with reference to the drawings. In the polishing step, first, an elbow 53 of an arbitrary branch pipe, for example, the pig / paint insertion portion 5 of the branch pipe 12 is removed, the polishing pig 8 is inserted, the elbow 53 is restored, and then the suction device 4 is started. The inside of the rehabilitation pipe 1 is set to a negative pressure.
At this time, the open / close valves 7 of all the suction pipes 6 and the open valves 41 used for releasing the negative pressure are closed. In order to maintain the pressure on the suction side constant, the pressure indicating controller 43
It is desirable to provide a pressure regulating valve 42 that is activated by the signal of After the negative pressure rises, the open / close valve 7 of the suction pipe 6 of the pig / paint insertion part 5 is slightly opened to introduce outside air while adjusting the intake amount. Adjustment of the intake amount is performed so that the indication of the pressure gauge 62 provided in the suction pipe 6 is adjusted to an appropriate value obtained by separately conducting an experiment. Automatic control can also be performed by using the pressure gauge 62 as a pressure indicating controller and the on-off valve 7 as a pressure control valve operated by the signal.

The introduced air flows toward the suction device 4, and a differential pressure is set up before and after the inserted polishing pig 8 to push the same toward the suction device 4. The polishing pig 8 moves while polishing the inner surface of the pipe 1 to be rehabilitated, and stops at the pig / paint receiving device 2. Rust and deposits separated from the inner surface of the pipe 1 to be rehabilitated by polishing flow on the suction airflow before the polishing pig 8 and are removed by the dust collection device 3 installed upstream of the suction device 4. Therefore, the function of the suction device 4 is not hindered by rust or the like, and the influence on the environment can be minimized.

The fact that the polishing pig 8 has stopped at the pig / paint receiving device 2 can be easily determined from the indication of the pressure gauge 62. After the suction device 4 is stopped, the opening valve 41 is opened to release the negative pressure, and the inside of the rehabilitation target pipe 1 is brought to normal pressure, the polishing pig 8 is taken out from the pig / paint receiving device 2 to perform one operation. Complete. Depending on the condition of the inner surface of the pipe 1 to be rehabilitated, this operation may be repeated several times, or the type of the polishing pig inserted at that time may be changed. By performing this operation sequentially from the branch pipe 12 to the branch pipes 13 and 14, the polishing of the entire rehabilitation target pipe is completed.

In the coating step, similarly, any branch pipe,
For example, the elbow 53 of the pig / paint insertion part 5 of the branch pipe 12 is removed, the inner surface of the pipe to be coated is painted, and a certain amount of the paint 10 is added, and then the coating pig 9 is inserted into the downstream side, and the elbow is inserted. After restoring 53, the suction device 4 is started, and the inside of the rehabilitation target pipe 1 is set to a negative pressure. At this time, the open / close valves 7 of all the suction pipes 6 and the open valves 41 used for releasing the negative pressure are closed. As in the polishing step, it is desirable to maintain the negative pressure at the pressure regulating valve 42 constant. After the negative pressure rises, the open / close valve 7 of the suction pipe 6 of the pig / paint insertion part 5 is slightly opened to introduce outside air while adjusting the intake amount. The method of adjusting the amount of intake is the same as in the polishing step.

The introduced air flows toward the suction device 4, and a differential pressure is set up before and after the inserted coating pig 9 to push the pig toward the suction device 4. The application pig 9 moves while painting the inner surface of the rehabilitation target pipe 1 and stops at the pig / paint receiving device 2. The paint 10 flows on the suction airflow before the application pig 9, and the coating is performed by the application pig 9, so that the excess paint does not reach the dust collecting device 3 or the suction device 4, so that a pig / paint receiving device is provided. It is received by the enormous part 21 of 2. The sprayed paint is collected by the dust collecting device 3, so that the function of the suction device 4 is not hindered, and the influence on the environment can be minimized.

It can be easily determined from the indication of the pressure gauge 62 that the application pig 9 has stopped at the pig / paint receiving device 2. The suction device 4 is stopped, the opening valve 41 is opened to release the negative pressure, and the inside of the rehabilitation target pipe 1 is set to normal pressure. Then, the application pig 9 is taken out of the pig / paint receiving device 2 to remove excess paint. One operation is completed. Depending on the painting situation,
This operation may be repeated several times, and at this time, the type of the paint or the pig to be inserted may be changed. By performing this operation sequentially from the branch pipe 12 to the branch pipes 13 and 14, the coating of the entire rehabilitation target pipe is completed.

Confluence pipe or branch pipe 1 to be rehabilitated
In many cases, the main pipe 11 is thick, the branch pipes 12, 13, and 14 are thin and the diameters are not the same, and the intermediate portion 15 has a different diameter. . By using a scalable polishing pig or a scalable coating pig that can cover various diameters of the target pipe, a single suction operation from the tip of a thin branch pipe to the open end of a thick main pipe is wasteful. Polishing work or painting work can be performed without any problem, and the possibility of rust, deposits, or paint remaining on the way can be reduced.

By adopting the above-described embodiment, in addition to the effects (1) to (11) described above, (12) both the pig / paint receiving device and the pig / paint insertion portion can be made of pipe material. It is easily manufactured from plate material, and other temporary devices are also general-purpose products, so they are inexpensive. (13) Pig and paint can be easily inserted and removed. (14) Stable negative pressure by installing a pressure regulating valve. (15) Suction work can be done by one person because the operating end and monitoring instruments are limited, (16) Installation of a dust collector avoids deterioration of the function of the suction device, and (17)
The effect that the influence on the environment can be minimized is obtained.

[0034]

According to the pipe rehabilitation apparatus of the present invention, since the suction method is used, the provisional equipment to be prepared does not become a large-scale equipment having a pressure-resistant specification, and the assembling is performed by a simple method such as fitting, and the operation and handling are easy. Since the pressure applied during the work is a negative pressure, the burden on the pipes to be rehabilitated is small, without splitting the confluent or branch pipes to be rehabilitated.
Grinding or painting of the entire piping system can be performed simply by inserting a pig or a pig and paint into an arbitrary branch pipe and sequentially operating the on-off valve of the suction pipe of the branch pipe, and rehabilitating large temporary facilities. The pig is always sucked from the open end of the branch pipe to the open end of the main pipe where the suction device is located, since it only needs to be installed at the open end of the main pipe in the target junction or branch pipe, so there is no need to relocate it as the work progresses. At the confluence, it is guided with a very smooth change of direction, and in general, it gradually moves from the branch pipe to the main pipe through the middle to the main pipe. This has the effect of preventing unexpected stagnation of the pig from that point.

In addition to the above-mentioned effects, the method for polishing the inner surface of a pipe and the method for coating the inner surface of a pipe according to the present invention can be easily operated by an unskilled person because the operation for moving the pig is simple. The speed of movement of the pig can be easily controlled, so that uniform coating can be performed, and the peeled rust and extraneous matter flow in advance of the polishing pig on the suction air flow, so it does not burden the movement of the polishing pig, and the power of moving the pig It saves energy and avoids unexpected stagnation of the pig, and paint flows on the suction airflow before the application pig, and even if the amount changes with the progress of painting, the load of pig movement does not change, so suction There is no need to adjust the pressure and the effect of saving power to move the pig is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an example of a pig / paint receiving device, and a view taken in the direction of arrows AA.

FIG. 3 is a partial cross-sectional view showing an example of a pig / paint insert portion into which a polishing pig is inserted.

FIG. 4 is a partial cross-sectional view showing an example of a pig / paint insertion portion into which paint and an application pig are inserted.

[Explanation of symbols]

 1 Confluence pipe or branch pipe to be rehabilitated 2 Pig / paint receiving device 3 Dust collector 4 Suction device 5 Pig / paint insertion part 6 Suction pipe 7 Open / close valve 8 Polishing pig 9 Coating pig 10 Paint 11 Confluence or branch pipe Main pipes 12, 13, 14 Branch pipe 15 Same intermediate part 21 Paint receiving enlarged part 22 Lid 23 Hinge 24 Clasp 25 Receiving pipe 26 End lid 27 Hole 28 Rehabilitation pipe connection part 29 Dust collector connection part 41 Opening valve 42 Pressure regulating valve 43 Pressure indicating controller 51 Elbow 52 U-shaped tube 53 Elbow 61 End plate 62 Pressure gauge

Continued on the front page F term (reference) 3B116 AA13 AB51 BA02 BA03 BA08 BA24 BA38 BA39 CD41 3H025 EA01 EB25 ED02 EE05 4D075 AG13 AG18 AG26 CA47 DA15 DB02 DC05 EA05 4F042 AA16 AA26 BA06 CB03 EA12 EA21

Claims (3)

[Claims] An open end of a main pipe of a junction pipe or branch pipe to be rehabilitated is connected to a suction device via a pig / paint receiving device, while an open end of each branch pipe of the junction pipe or branch pipe. A pipe rehabilitation device in which a pig / paint insertion part is connected to the other end and a suction pipe having an open / close valve is provided at the other end of each pig / paint insertion part. 2. An open end of a main pipe of a merging pipe or branch pipe to be rehabilitated is connected to a suction device via a pig / paint receiving device, while an open end of each branch pipe of the merging pipe or branch pipe. The pig / paint insertion section is connected to the pig / paint insertion section, and a polishing pig is inserted from the pig / paint insertion section of an arbitrary branch pipe by using a pipe rehabilitation device provided with a suction pipe having an open / close valve at the other end of each pig / paint insertion section. After the suction device is activated and the inside of the pipe to be rehabilitated is made negative pressure, the open / close valve of the suction pipe provided in the pig / paint insertion section is operated to adjust the intake amount and to release outside air. A method of introducing and moving the pig in a pipe to be rehabilitated by a differential pressure generated before and after the polishing pig to polish the inner surface of the pipe. 3. The open end of the main pipe of the junction pipe or branch pipe to be rehabilitated is connected to a suction device via a pig / paint receiving device, while the open end of each branch pipe of the junction pipe or branch pipe is connected. The pig / paint insert section is connected to the pig / paint insert section, and the other end of each pig / paint insert section is provided with a suction pipe having an open / close valve. After inserting the application pig and activating the suction device to make the inside of the pipe to be rehabilitated a negative pressure, while operating the opening / closing valve of the suction pipe provided in the pig / paint insertion section, adjusting the intake amount A method in which outside air is introduced, and the pig is moved inside a pipe to be rehabilitated by a differential pressure generated before and after the coating pig, thereby coating the inside of the pipe.